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Population density is the number of individuals per unit area. Population distribution is how individuals are spaced out in their range. Growth rate determines whether a population grows, shrinks, or stays the same size. Age structure is the number of males and females of each age in a population. Population Growth Populations can grow, shrink, or stay the same size. Factors that increase population size include births and immigration, which is the movement of individuals into an area.
Population Dynamics. T he dynamics of bird populations, the ways in which their numbers grow and shrink as time goes by, are controlled by the same general factors that control the size of human populations. An avian or human population has two kinds of input -- birth (natality) and immigration.